Study of the angular distribution of the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.3037· OSTI ID:6276873

Armstrong, T A; Bettoni, D; Bharadwaj, V; Biino, C; Borreani, G; Broemmelsiek, D; Buzzo, A; Calabrese, R; Ceccucci, A; Cester, R; Church, M D; Dalpiaz, P; Dalpiaz, P F; Dibenedetto, R; Dimitroyannis, D; Fabbri, M G; Fast, J E; Gianoli, A; Ginsburg, C M; Gollwitzer, K E ; Hahn, A A; Hasan, M A; Hsueh, S Y; Lewis, R A; Luppi, E; Macri, M; Majewska, A M; Mandelkern, M A; Marchetto, F; Marinelli, M; Marques, J L; Marsh, W; Martini, M; Masuzawa, M; Menichetti, E; Migliori, A; Mussa, R; Palestini, S; Pallavicini, M; Pastrone, N; Patrignani, C; Peoples, J Jr; Pesando, L; Petrucci, F; Pia, M G; Pordes, S; Rapidis, P A; Ray, R E; Reid, J D; Rinaudo, G; Roccuzzo, B; Rosen, J L; Santroni, A; Sarmiento, M; Savrie, M; Scalisi, A; Schultz, J; Seth, K K; Smith, A; Smith, G A; Sozzi, M; Trokenheim, S; Weber, M F; Werkema, S J; Zhang, Y; Zhao, J L; Zioulas, G ^[1]

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1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States

We report on a study of the angular distribution in the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is [ital B][sub 0][sup 2][lt]0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is [ital a][sub 2]=[minus]0.14[plus minus]0.06. The normalized radiative decay octupole amplitude [ital a][sub 3] is found to be consistent with zero.

• OSTI ID: 6276873
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 48:7; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTON-ANTIPROTON INTERACTIONS
RADIATIVE DECAY
ANGULAR DISTRIBUTION
CHARMONIUM
DECAY AMPLITUDES
ELECTRONS
J PSI-3097 MESONS
OCTUPOLES
POSITRONS
QUADRUPOLES
AMPLITUDES
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYON-BARYON INTERACTIONS
BOSONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LEPTONS
MATTER
MESONS
MULTIPOLES
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
QUARKONIUM
TRANSITION AMPLITUDES
VECTOR MESONS
662420* - Properties of Mesons & Meson Resonances- (1992-)
662350 - Decays of Mesons- (1992-)
662390 - Electromagnetic Processes & Properties- (1992-)
662340 - Hadron Interactions- (1992-)